James Dyson has accused Bosch and Siemens of manipulating energy efficiency ratings but the firms disagree

Bosch and Siemens to sue Dyson over efficiency accusations

German appliance manufacturers Bosch and Siemens said they are taking legal steps against Dyson for its accusations that the two had been cheating in energy efficiency tests.

The British firm known for its bagless vacuum cleaners has taken Bosch and Siemens to court in Germany, Belgium and the Netherlands, alleging that they had misled consumers in ‘behaviour akin to the Volkswagen scandal’.

However, BSH Home Appliances, the parent company of Bosch and Siemens, strenuously denied the allegations and today announced it was initiating legal steps against Dyson over the ‘unfounded and untrue’ statements.

"We have long since been aware that James Dyson has a history of taking a very aggressive approach against his competitors and has a desire to be in the public eye,” said BSH chief executive Karsten Ottenberg.

"With his completely unfounded accusations of cheating in the past week he has now overstepped the mark, which is why we will now initiate legal steps against Dyson."

The company said all its vacuum cleaners were tested in accordance with the EU Energy Label and Ecodesign Directive for vacuum cleaners and met the standards in full.

Dyson claimed that independent testing had shown that machines made by Bosch and Siemens could draw more than 1600W of power when used in the home despite having a rating of 750W.

“We will not be diverted from what is a crucial consumer issue," Sir James Dyson said following the announcement by BSH Home Appliances. "What Bosch and Siemens have done we believe circumvents the purpose of the EU energy regulations and misleads consumers.”

According to Dyson the vacuum cleaner of the two German manufacturers work at a lower power setting when there is no dust, as is the case in testing situations.

It claimed the Siemens Q8.0 and Bosch GL80/In'Genius ProPerform models use a sensor which sends signals to the motor to increase its power as the machine sucks up dust.

This would mean a rating as high as AAAA in test conditions could drop to an E or F in the home.

But BSH said it launched new technology in 2013 featuring intelligent sensor technology to avoid loss of suction, no matter how full the dust bag is.

It said the sensors controlled the vacuum cleaner motor fully automatically to prevent a loss of performance and guarantee optimum cleaning in the shortest time.

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